Apr 8 – 12, 2024
Maison MINATEC, Grenoble, FRANCE
Europe/Paris timezone

Measurement of the 1-jettiness event shape observable in deep inelastic electron-proton scattering at HER

Apr 9, 2024, 5:40 PM
Maison MINATEC, Grenoble, FRANCE

Maison MINATEC, Grenoble, FRANCE

3 Parv. Louis Néel, 38054 Grenoble
Regular parallel talk WG1: Structure Functions and Parton Densities WG1


Johannes Hessler (<PI Munich)


The H1 Collaboration reports the first measurement of the 1-jettiness event shape observable $\tau_{1}^{b}$ in neutral-current deep-inelastic electron-proton scattering. The analysis is based on data recorded in 2003-2007 by the H1 detector at the HERA collider for ep collisions at $\sqrt{s}=319$ GeV, with integrated luminosity of 351.1 pb$^{-1}$. The observable $\tau_{1}^{b}$ is equivalent to a thrust observable defined in the Breit frame. The triple differential cross section is presented as a function of $\tau_{1}^{b}$, event virtuality $Q^2$, and inelasticity y, in the kinematic region $Q^2 > 150$ GeV$^2$. The data are compared to predictions from Monte Carlo event generators and NNLO pQCD calculations. These comparisons reveal sensitivity of this observable to QCD parton shower and resummation effects, the magnitude of the strong coupling constant, and proton parton distribution functions, as well as the modeling of hadronization and fragmentation.

Primary authors

Daniel Britzger (MPI Munich) Johannes Hessler (<PI Munich) Stefan Schmitt (DESY) Zhiqing Zhang (IJCLAB Orsay)

Presentation materials